Search results for "RAV"
showing 10 items of 5866 documents
Calidad de la preparación de quimioterapia asistida electrónicamente
2020
Los sistemas tecnológicos de soporte a la preparación manual de quimioterapia (QT) parenteral constituyen una de las principales herramientas para la prevención de errores de preparación (EP) en estos tratamientos. No obstante, la evidencia científica que respalda su beneficio potencial en la práctica asistencial es aún limitada. OBJETIVOS La Tesis Doctoral que se presenta se ha desarrollado con el fin de mejorar el conocimiento del valor añadido que aportan estos sistemas tecnológicos en la preparación de QT parenteral, en concreto, el Sistema ePASE® (IMF, SL), que integra un control de calidad cualitativo, mediante verificación del código data-matrix (DM) de las presentaciones, y cuantita…
Regularisaatio vahvojen gravitaatiolinssien inversiossa
2015
Massiivisten galaksien gravitaatio aiheuttaa vääristymän teleskoopilla havaittavaan kuvaan muuttamalla galaksin takaa saapuvan valon reittiä. Niin kutsu- tuissa vahvoissa gravitaatiolinsseissä voi linssinä toimiva galaksi tuottaa kuvaan sen takana olevasta galaksista useita näyttäviä kaaria. Linssinä toimineen galaksin massa ja linssiytyneen galaksin alkuperäinen muoto voidaan tällöin laskennallisesti selvit- tää, ja näin saada tietoa linssigalaksin massan ja teleskoopilla suoraan havaitun valon määrän suhteesta. Tämän lähtökohtaisesti huonosti määritellyn inversio-ongelman laskennallinen ratkaiseminen vaatii kuitenkin ongelman uudelleenmäärittelyä eli regularisaatiota. Ongelman ratkaisemis…
OGLE-2008-BLG-510: first automated real-time detection of a weak microlensing anomaly - brown dwarf or stellar binary?
2012
The microlensing event OGLE-2008-BLG-510 is characterized by an evident asymmetric shape of the peak, promptly detected by the Automated Robotic Terrestrial Exoplanet Microlensing Search (ARTEMiS) system in real time. The skewness of the light curve appears to be compatible both with binary-lens and binary-source models, including the possibility that the lens system consists of an M dwarf orbited by a brown dwarf. The detection of this microlensing anomaly and our analysis demonstrate that: (1) automated real-time detection of weak microlensing anomalies with immediate feedback is feasible, efficient and sensitive, (2) rather common weak features intrinsically come with ambiguities that ar…
Search for anisotropic gravitational-wave backgrounds using data from Advanced LIGO and Advanced Virgo's first three observing runs
2021
We report results from searches for anisotropic stochastic gravitational-wave backgrounds using data from the first three observing runs of the Advanced LIGO and Advanced Virgo detectors. For the first time, we include Virgo data in our analysis and run our search with a new efficient pipeline called {\tt PyStoch} on data folded over one sidereal day. We use gravitational-wave radiometry (broadband and narrow band) to produce sky maps of stochastic gravitational-wave backgrounds and to search for gravitational waves from point sources. A spherical harmonic decomposition method is employed to look for gravitational-wave emission from spatially-extended sources. Neither technique found eviden…
IS THERE A CONTINENTAL BIAS IN TRADE?
2011
The relationship between geography and trade is a central topic in international economics. This paper investigates the potential existence of a continental bias in world trade flows on a sample of 182 countries over the period 1990-2006. Using traditional estimation techniques and recent developments in the econometric analysis of the gravity equation, we find robust evidence of an economically significant continental bias in trade. It implies that, other things equal, countries located on the same continent trade more with each other than countries located on different continents. A continent-by-continent analysis reveals that Oceania, America, Europe and Asia are behind this result. Afri…
The migration–tourism nexus in the EU28
2020
This study explores the nexus between tourism and migration on an intra-European scale over the period 2000–2015. Complex-network analysis and gravity models were the investigation methods preferred. For each year under study, we built two country-to-country networks to map and reveal the connections between states as shaped by migration stocks and tourism flows, respectively. Then, the main determinants of the correlation patterns between the two networks were investigated by several econometric analysis. Results point to a quite similar topological structure for the tourism and migration networks as well as to a significant and reciprocal direct influence between tourism and migration mo…
Model uncertainty and variable selection: an application to the modelization of FDI determinants in Europe
2019
Las últimas décadas han visto un interés cada vez mayor en la IED, y un debate creciente sobre su modelización en términos de las variables consideradas como sus determinantes, la especificación del modelo y los métodos de estimación del modelo de gravedad de la IED. Esto se debe a la incertidumbre que rodea tanto las teorías como los enfoques empíricos de la IED. Esta Tesis doctoral tiene como objetivo contribuir a la literatura mediante la investigación de las fuerzas impulsoras de las actividades de las EMNs hacia y desde los países europeos, tanto a nivel regional como nacional, abordando los problemas de selección de variables e incertidumbre del modelo que se enfrentan al modelizar la…
Intra-regional mobility of PhD students in the European Union : the outcomes of region-making policy?
2022
This paper examines the flow of intra-European Union (EU) students for doctoral (PhD) studies to identify reasons for differences in international student mobility and migration (ISM) among member states. Rather than conceptualising intra-EU PhD student ISM only through push–pull forces, we theorise the intra-EU PhD ISM is associated with relative levels of national resources or levels of capital. We investigate the intra-EU PhD ISM through dyadic country pairings allowing the use of Gravity models to estimate the effect of variables associated with stocks of capital ascribed to a country to the change in the number of PhD students. The findings of this study indicate while there is asymmet…
The determinants of FDI: a new network-based approach
2022
This article investigates the determinants of FDI at sub-national level. It recognizes that MNEsModified Letter Turned Comma foreign activities are organized in networks of strongly interconnected, but geographically dispersed affiliates. This implies a different approach to the analysis of the determinants of FDI, which should focus on contextual factors able to stimulate economic relations at distance. Methodologically, we use a gravity-type model and different regression techniques with a new dataset on networks of FDI involving German and Italian regions. We find evidence that technologically proximate regions sharing the same industry profile are more likely to experience positive and …
Examining the impact of visa restrictions on international tourist flows using panel data: Un análisis con datos de panel
2016
Using newly panel data on visa restrictions for the years 2000 and 2010 in a theory-grounded gravity model, we find a robust, causal negative impact of visa restrictions on international tourist flows. By destination, the detrimental impact of this type of barrier is observed for tourists going to developing countries (with the exception of East and South Asia), but not for those to developed ones. By country of origin of tourists, the impact of visa restrictions appears to be the same for tourists coming from developed and developing countries. These findings have important consequences in policy terms for tourism management at a regional level.